The Internet Mail Service administrator account is no longer valid. The
Internet Mail Service will not start until you recreate the administrator
account or configure the Internet Mail Service to use another administrator
account.

Internet Mail Service starts with account that is assigned service adiministrator rights, domain admin rights, and that is `service account` in configuration properties.

A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA).
For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651
If you want to manage em…